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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71da1c5751405966361d3c49f8d2c1c455feca78273839cb479a6b171c22c0cf' 
  AND token = 'aLZI+G1bN2xT0kUpZZYF/nc1HX7hBjxzf7o5Nhkt+8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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