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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71625bc6b5474b20246ae3e9ae734b017557b85692f7480fac847d479c8d9828' 
  AND token = '4E+WblHx47+znu1BVptD6qmbw0obj3R43TTwLwqQ6aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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