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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a2f083e05dd6cb0f6bac7f7048e6c585811a00ceecfb185e2302906b5e5e9e' 
  AND token = 'cBY/pQOvWfHuY7H7qO/Sy3JHp13WcZwkc+duk/eoDjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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