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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75893b4d78c96582b21ddd5effa0475ff510dd2553a6b662d0da94565e758e26' 
  AND token = 'JB2SNIzF3CWESlhWAE2TLzZj5BYoubX/Jeat+M0mmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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