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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdfb3afa91b4640956c2b6ce986c7ddb008dec2fc4d1e8c8c74308ce031c936' 
  AND token = 'qmwKnftz+rY7gaSgv4RQ4ImetER9w7m2gn877PHN+iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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