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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e419e0b16bf7040dfc0e6e28377a89f63f102a8da8cc1d15c14e5f28aa55e502' 
  AND token = '380sO/OvbNSfrTt+OsF5/Zmwub2NyriWpHSQA0xUdzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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