SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d852852cc79d3ce6c6c133f549d6ffeb4e4fd7e6a2684d498ed63aa6b41431' 
  AND token = 'PYtrgGnHC7wnNQoDPv3nGVs2EMVAO/BXEFR0HlzSoG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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