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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1433fec5451c31d659fb35c0201747e7c53c754797808f5ca2968253291c0b72' 
  AND token = 'xhr+bxAe0BZJGSyLOnHa0mf4QSgilVy/i0HaEZ8Aacc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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