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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '739a850c9c5400f3691799e685abf4adcce25e47d30511b85d2143002ccadc72' 
  AND token = 'bE9liDPCSpa7XKoaXix7yeq97wKORzsWBfU3vpfd8+8=' 
  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"
    }
  }
}