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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f08e429956fe6a75c3765a7a7de86ba26eaf2f227a7e623fe7fb19e0f2b7a0b' 
  AND token = 'WW2OKR9+0KPwJgj380danOaiSpG4E79a1UmjxW3L3QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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