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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2788a7e8004124af80b44f32686f863b7e7cbdf2d42be183acc0bfbdb99764e3' 
  AND token = 'qha7ayz//4ulGhXlmk0rWodE1+T11rPbF8WwaNGBNeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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