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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d897c6ea05293096271f3da325ccfade90f0366a8d0528ea4c2973ad46cbe68' 
  AND token = '2R6dhATD28l4fe/IhZ/FXO04Ua9HOkf2SmJch0zOiiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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