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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd03c9f02ba416b6d05af4f2be827271e62e63836c4ad43a9aaa746283d67cc' 
  AND token = 'oebXgRFHWz30EJzQ3XCkpz3pyHKW2v2fNNmmQnu1IYE=' 
  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"
    }
  }
}