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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9ba1619de5c9642b84864b694f2d891ebace35635457586997225f675e6a02' 
  AND token = 'y0cUDOt/0Hd31eWtqaj56sEjsIJaid0AA22kZ1p/bzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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