SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d635d2cba466d03c5cd178ffd4af3136e11ee5df4cf19534fc3d97907c6682' 
  AND token = 'oaj6PjGnFL8dlK/J+MbUS7kGNCSGAoUjBHyCukCVsvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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