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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719ef7688b6bc3930ec813f31121419f2994268ceee894d735f0c1b301ad4876' 
  AND token = 'thGQRx0LpxyIFJypmuBSNJ4JCIFK/ZV8k/ED7Cxz/rk=' 
  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"
    }
  }
}