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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4a5eb17ce643cb5604b4a1b2d43ca2286cc1f47d5e72a0ece4809a79972b85' 
  AND token = 'UB8r5heW4sGP81LG2Ddy63QiYmyKJDJ8X7uknz7k+YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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