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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e1065c6574f8ea3fb0ed1f24a74c9ed196d5618ad001a8c1a14d4a34c615ad' 
  AND token = '7GPTGBCuLlIARfZeFcLtD9pbT5yiASe98siGx8uZYfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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