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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '940a301f5cd2006286a306709194f32e6b64cfb43c9a82cd7122206be6a8ee2b' 
  AND token = 'irLFpGcyvooR/lmLRF87euAP2Dl2Q0lWCnCD5untECo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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