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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a6fb659b5ef5c30cc92f17ff66fd56b228a80b0fe4717c1203fd242161ddd23' 
  AND token = 'oT9v32q42+vwlYATy3yr8lX7I8Gkzqb4wcxkRLMXigc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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