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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c2bae48c415198d1c4481eb07ae9b1c6a442588e6e750233f65607a9e5d7ef' 
  AND token = 'pCFwhZFXlZwPj2+YocPRSxRxFa0U41BTMOioD5RsMoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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