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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464f29d5cc7508fc7d86e3fe6e61cc983236371b09f35a779e5ed168ca2143a6' 
  AND token = 'Q+zaCb8WkQKydl/YKg5gHMi55txx1zwkTHRKvnNU+Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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