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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40eeeb6b3e5d7ddf298b64dc1db7eee88c4b6c25a4f0ba532c3ddfa24db4fab7' 
  AND token = 'S+nqr516C0Kc/ZgCFLbWziGconA174051VncWY6v+/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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