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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca7124b76aab8a794f1678159bca9394e3a5d377b2be7c0b76dcde692871270' 
  AND token = 'K4vCsq3btz/q2ofyBSwfyxHFG3bfZT8WmT5SMF7bGC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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