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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0bd29bfb08f6f95bae9d3a5330cf5d6b0d6e0cc53df9b821d9dc6a09bd7c05' 
  AND token = 'zFsi4Ynfu5lyqxWpIXgRIppVRkKPbO5bwrwM61tMJ/k=' 
  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"
    }
  }
}