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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599a5a54a81d74ff1325a320f7518a9dae1536f0ea162433b037368d502e6427' 
  AND token = 'O28u7ofc2h5dnWltm0OOF4RCRr5hMaZioVXiU2gzgLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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