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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6743316edb0631477538b74cf546d66695e9cdf5a9522e9af24488676677fcc' 
  AND token = 'AK7D1K5b+r4iZjVr61UETmOLyAqicfLZ0Cb6wg4BXLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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