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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0ccd4b4fa25a29823e403338be311cd9c079222f5e7bab5fa1e31f37e016a5' 
  AND token = 'IJK0lhhllMMVycAZ2luQdpfTxleZwstSLJe5F1PXNT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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