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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68be552f6e71be8f320a6799258b5436c1dcbd5f8733a41aa2dce4d5ddc7ed14' 
  AND token = 'VjPail+aXpO6F2Sm+D4WwwMMWAOu9DDbL3LKsGQNehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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