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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f547786999c543afd364a193bd79fc922f4079b5e4a921cd50853a9c80c61caa' 
  AND token = 'Uond30xzHHkOSXg79qTWPBnwffmaEI+R9i52UgT/Mto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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