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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb55e53ce5568108ff02528550a724ba4b7f213ff8ac91a5af9e95922f0cca70' 
  AND token = '/Yy4xAFn+64zGantY7UrqKlScD8XjB8qWg30so6Q2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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