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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4ab65ae6eb348c638a08166b810f8890d730dafaa6e5544ebf6272ecc5a51a' 
  AND token = 'OtPiWBELM3Fe1xUxNgN61cpqznC30OrxXSnG0/vK8s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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