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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '17cd59204f9dbd5be672eccc8c2d193ae127b175ca6c4bd5d54b1ac415b51acd' 
  AND token = 'j+u3RqcR9CFF11i1TkVPUneGrCovph4rqSv4VotULzs=' 
  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"
    }
  }
}