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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912f4bac4edc7ef6c453e51a5af7b303acb9285bd38ddbb19ac731ce9ea13ca7' 
  AND token = 'Bs722JsM3E1kBXHY0dwmGSbJG5jigisejwtVevGL6Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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