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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a84121e439bd3b289b667e3780039c11e8c5e4a2c6a0691f03d88f1f69478ab3' 
  AND token = 'yX79Eo8hSnE05bbyzOM833y6bO3UMuyUL7DxDUWlgnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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