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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca04ab7fbb28504baf08b3c645778bedb554ff85eaa3f7f1ee001b3b984eaac' 
  AND token = 'G+8XFOai8NZdJIj1Yq/EyFuTL6HkZUs7FxmR826G1NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}