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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6583f506f10f7c12dfd22a981046dbc8329d89c70f9f4728f5650ae793821a9d' 
  AND token = '9y0oMkVgfTBH7MHVsnkY4vLBjwbvO2j2IJGoodHrRLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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