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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9aab86888380d268913e7c7a2397004a084c7dcc3f0255f60b66c047519c25' 
  AND token = 'COlhi4QZookA919o59e4Ommg/wj7J2lm/X4RepGHOWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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