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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '713a82055c7dea46a634d2f1fed0c6145a614d58d55a97aa33f16947743ce387' 
  AND token = 'Xj415ggzGmNC5AdY1yh+3nX5j1S28pEbgBQBMMI/Rg0=' 
  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"
    }
  }
}