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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ef4289f38c7ab4a08b8331eeadb0a06b5fb306dc4cbc74f013570386202011' 
  AND token = 'RJNu07spCosHu1rps3m4N7X6Tkz74+o4j9VWLA+hoRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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