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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a6c2a1324ae7c036633ddcaa78ddf05506ecdad92356fd032d185b1f4b50c352' 
  AND token = '5kMxDKFeB9Xt6Z/WVNv1ku/cklVtWCe3SGF1fpLIzRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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