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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3ef423f6b1a754beac5c0a3d4ebe85d5e7ea0c2b7f82f3282a735350d2ccab2b' 
  AND token = 'TGRf6gvBTPe4tIPMu0Mm0n55swyeedMlbNt4Ko62NkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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