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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b016ef759250d5eccdedbf968aa7cdfaa6023c5f2d86736d7e23eb449907df3e' 
  AND token = '/yHt+NKo/k4IvbAt5B5JeUX4ZDsdIgbT3M+76U/u96g=' 
  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"
    }
  }
}