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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6f51fc10ec4c21ecefc35c9d5cfe9a963164723c80879ed624e2cec177d0c876' 
  AND token = 'yDfdt8st2VAXGsF6ud/iujEZWkL99mvsykVBs0uzFwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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