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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4261b465673129436bcacd410c5151d94fc993d0c32958806d93d0cabbf3d22c' 
  AND token = 'TnQfB0llN3SaVese31WX5PH0Bvrd1nqjwagpBkqjW2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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