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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd29217d0279c390908a7b8ea39a621ac37af5dce65ec6afbc7a0884593352' 
  AND token = 'LQkg5voPsSypiHVB68nlKlxiK8iYE8X5EFHd0OiScAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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