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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c2c04f9b3c8b775baa07cd7ac3fa5100f7cd4d7733df98dcc98b9de6f44c171c' 
  AND token = 'JOsgGiZ+2k9LyWYs1GABAhtSExT3PsYbSAheNZqsH3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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