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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a9c90742245cc098e3dc1abf28fb35f1dbfac9e97ab2b2877494b7ef0e3ab4' 
  AND token = 'xbj5Fm3TjIuKlfpr+1EQG+XlP2rkGmgoOrjKCcM16B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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