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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce81b0d0c73b55177fd3545a8e2abd90d77120034811fcce9314459b130e1bd' 
  AND token = 'L20VE3McaEdEJZG7qZ+u1L6aqTF0JYr8eell9/9QQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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