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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d382f3cded211d0f084c2bd5c2a0905c05f4e1b3b5b6c255060b3ea9814f479' 
  AND token = '7ZelpCkw6uPa2SySx19vEHy/P6/RD+hynkyUwrfr9W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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