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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054ba5d35ad20b9d7744f4cccc4194b6311c4e9ee178e987e6af4455ac6882b5' 
  AND token = 'vNv/JOAtoxzNa1Ij4B1hjKDsL6g78N5duuHFkbhKO0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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