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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2bd1ad48673375610ad4999f87727261942603c82a12faf6db0fe04eb8779c' 
  AND token = '3rC8Yjqp1ymGxAd44pdwy36eC3VV8bWwvSgScvyN+xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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