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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176bc77091b4ade46f4bcc888ab50579d5291291b1892c625114ba61bc6469db' 
  AND token = 'Gfy5r6F9IXRVDfilD/BaQ5GyyV/sIVh48tawilaCuqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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