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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd761c682b4b2db84822866abf43f59f8b84268681d8b34c228dedb139935d7' 
  AND token = 'b3eg/GMNll95T3Kpl21DwsAB8+X03QQXrF15EhwWgLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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