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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03096dac4dd6cabf6c866f613bb68b7a1d52402cbfddbe28e69d2afcf3f3746e' 
  AND token = 'Qp9pOUReiBtj2sY6fuZ1dsa91fYyOT+bHiGjwwwTGc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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