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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4296b034e788cdfcc9d0c8721b2ef13a1d63ed30160c449fc5e088ed0cec5751' 
  AND token = '6E7zloAHWYUzx47MiYw5z72mAYwr6MSAmHp3Uo/wBH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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