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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587c09e4e9519e7878a89a9a7da6e6b9e08fa69f8f7b61b421b60ad14886de21' 
  AND token = 'T8IfDGfNQUPQGolWDA36iHZsflJtD5gzGAWuDZHdsWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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