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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07e9f264532c1a27d6f6555a093483b7ee9539aef6d7ce2c45728f4a63eee0f' 
  AND token = 'cieZOch/Z1zEAQ5iyq6uoXmlY40aWUWhRPRytI0vWt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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