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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8fd0aa885e6dd00d5fc2cffec57d88347c032be0f788b4488ecf12a6f2ff3a' 
  AND token = 'DNni3yb8hfY6qI9Oi/rZvyOOeHpVFVBirNY2c7MNnjE=' 
  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"
    }
  }
}