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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336ad32401dce289868bf6fe2745f8257ece268086920865139712e7facd5465' 
  AND token = '5G8UpNg944m2xSKfn/2uRohS2U18PF20R20YXs7fWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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