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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c44545d825a66c9654660647e4f5b6687a273df3ce4812d8c73b44250e34149' 
  AND token = 'new+nI5WZRv6vKCOfor/E7Yqh2qQJFnRvZdJqym4Gns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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