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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b152231fd0524fe3fa96c734d420527489ed2214b3ad8566d440783005bed4' 
  AND token = 'tolvHj58A9Oi19CAariaYP72lY0gnsYK6Az6Jp3W/4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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