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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a05e8e46385c9805858f48a0a9dd5d2968e606c4b4bd92d42c0b1100f369c4' 
  AND token = 'U1iT+ACXqJURGjdkKtp4bxVqt41/pZLt9pqh7aPggKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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