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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49b4f2c946a25b9a05d71dfe8eb532fd2d7bc15397e6b473034f2519ea92db4' 
  AND token = 'nMBP4vyqp/V7wk2qrpFs5DxrIBgk3w0IWUPZr3zwR54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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