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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627e9ea83e3fac5dc60bd2d3eff3d1288cb9a5f17eb72aec6924cd3743099a9e' 
  AND token = 'OCCzIPLNLL3UX/3PLh/ZJledswPncNTl43QECn3429U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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